DETERMINATION OF DINOSEB BY ADSORPTIVE STRIPPING VOLTAMMETRY

A sensitive method is described for the determination of Dinoseb (2-sec-butyl-4,6-dinitrophenol) at nanomolar levels by adsorptive stripping voltammetry (AdSV) at the hanging mercury drop electrode. Cyclic voltammetry studies showed two well-defined reduction peaks, at -0.21 and -0.36 V, and demonstrated the adsorption of Dinoseb and its intermediate reduction product on the electrode. A systematic study of the experimental parameters that affect the stripping response was carried out using differential pulse voltammetry. Using a 120 second adsorption time, the limits of determination and detection were 1.5 x 10(-9) and 4.6 x 10(-10) M, respectively, and the relative standard deviation (n = 10) was 3.9% at a concentration level of 6.0 x 10(-9) M.